Pennzoil
5W-30
Normal idle
77,000 miles
At or slightly below first line @ 18-20 psi

 

Castrol 0W-30 german made when warm at idle 30Psi while driving around town 65 to 70 Psi. I have 108,000 miles on it.

 

I think I might try that next

 

Castrol Syntech 10w-40 and Lucas synthetic oil stablizer. 65 psi cold and 35 psi hot at idle with a 950 rpm idle. 55-60 psi cruising and 55 psi at WOT. This is on a 355ci LT1 with 5,000 miles on the clock.
HVY SS

 

Oil type: Mobil 5000 10w30
Idle RPM: 550rpm
Gauge level: just barely above the red
Miles: says 141k but speedo has been 35mph fast most of its life.

 

German Castrol 0W-30 idle is around 42 psi, tops out around 60 psi.
Seems decent enough for 105,000 miles.

 

50-60 psi on start up (Royal purple 10w40)...........then first bar when it finally warms up.............jumps to 40 when i am cruising/moving at anything over 10.........at WOT it jumps to about 45psi

--Scott

 

20 PSI @ hot idle
40-45 PSI WOT

 

20-50w penzoil 60psi hot at idle
high pressure / high volume pump

 

Redline 30 wt
20-70 psi

-Mindgame

 

Ah yes, a straight weight. I wonder if anyone has the guts to question your choice, or at least ask your motives. What are your motives by the way, if you don't mind me asking? It took me many years before I jumped on the muli-weight band wagon, and now you throw this monkey wrench into the mix, thank you very much. Please explain.

 

95K miles, redline 10-40, 30psi @ 900rpm hot.

 

Castrol Syntec 0w-30 German I have been running this oil for the last 30,000 miles on this car with good results from oil analysis. My car has almost 124,000 miles on it and it has a cold idle oil pressure of about 40-45 psi and a hot idle oil pressure of around 20-25 psi the hot idle is at about 550 rpms. Under normal cruising speeds (60-65 mph @ 1,900 rpms) the oil pressure is about 40psi and WOT it stays about 55-60 psi. My oil pressures were a little lower when I was running 5w-30 mobil but mobil is really more comparable to a 20 weight. I have also used Mobil 1 0w-40 but I have been more happy with the Castrol.

 

You mean to tell me there are people who will argue against one's personal experiences with rhetoric found in magazine articles or perhaps something an internet "expert" has said?

I'm no "expert"... not by Frank Lloyd Wright's definition anyways.

I do know Redline states that their racing oils (30 wt is designated as such) have exceptional low temperature lubricating properties on a scale similar to 10w30. I also know that Redline does not recommend their "race" grades for street cars but that has a lot to do with the additives they use which aren't good for catalytic converter life. Those same additives (zinc and moly in particular) however ARE great for heavy wear components like roller lifters and camshafts. I'll trade that for the cats. Besides, I stay on top of my tune and I don't run a ton of overlap. My car probably runs cleaner than many I see on the expressway every evening.

Hope I've explained myself to your satisfaction Z-Rate.

-Mindgame

 

Just to throw something at you, most of the tachs in these cars are off by 100-200 RPM. Ie. My tach reads 1k @ idle while the computer says 850. That said...

850 rpm idle
~50 psi cold
~30-38 psi warm
~40-45 psi @ 65 mph, 1550 RPM
???? @ redline
Mobile One 10w 30

MG, aren't racing oils less likely to froth up, similar to the oil I use in my bike? Just curious.